I've mostly been doing Elements, and I'm halfway through. Here are a few of my favourite things about GMB: The programs are super easy to follow... you watch the video instruction for each exercise, and then skip it when you know it well enough... and there are little noises (like dings) to cue you when to start each exercise, switch sides, and finish it... so I don't need to keep my eyes on the screen. I can get a 15-minute session in when I don't have time for other exercise and it leaves me feeling accomplished and good. I love that we're encouraged to write quick onscreen notes after each session to debrief. There's more, but they asked for a short review :) Bottom line, really well-thought-out program that I recommend.